https://www.shutterstock.com/discover/10-free-stock-images

Question. If I go into store buy something, or paying my bills should I please only trial version of bread, milk, wont paying bills, social security, medicare etc.,maybe next month we will do the business side?

I've got an interesting feedback one of my customer, that she is hardly find suitable conceptions at stock agencies, due to tons of overhelming same conceptions, or same images in various crops, filters etc.
For example on Shutterstock ID: 433880728, 436619266, 437470180, 447365770, etc. 

Second thing is worst. From this style (examples above) are tons of photographers (or maybe stawmans?) with different countries of upload, who copy this style - sometimes with international faces - on local professional market I dont know personaly anyone of them, but those models acting professionaly, not just first shooters - the pictures are hardly filtered, fake flared etc. as at main uploaders.

Why agencies allowing this ?

In my portfolio are 6000 pics in SS, Fotolia. I plan reduce the size to best earner 1000 pics, others, unsoldable, low earners, delete. Is it good idea?

I've noticed some of contributors in top tier agencies has only 500-1000 best pics in their portfolio, but they are selling lot.
Is it good big portfolio with lot of unsoldable pic, or smaller portfolio with the best soldable works ?? Will you find anybody easier with large amount of pic ??

Thank you